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Other Long-Term Assets - Summary of Assets, Liabilities, Partners' Equity and Equity Income (Loss) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of joint ventures [line items]      
Current assets $ 7,057 $ 5,942  
Current liabilities 8,651 7,422  
Partners' equity 38,175 36,945 $ 32,380
Revenue 49,530 32,854 17,491
Net earnings (loss) 10,937 7,664 (435)
Depletion, depreciation and amortization 7,353 5,724 6,046
Interest and other financing expense 549 711 $ 756
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Partners' equity (551) (562)  
Revenue $ 317 294  
Company's voting percent interest in joint venture 50.00%    
Partnership distributions   400  
Percent of pro rata share of debt company has committed paying to joint venture, toll payer percent 25.00%    
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets $ 257 280  
Non-current assets 10,729 10,806  
Current liabilities 849 798  
Non-current liabilities 11,239 11,412  
Partners' equity (1,102) (1,124)  
Revenue 1,267 1,168  
Net earnings (loss) 22 $ (18)  
Partnership distributions paid, interest percentage   100.00%  
Partnership distributions   $ 800  
Depletion, depreciation and amortization 245 278  
Interest and other financing expense $ 422 $ 412